[aloer]

Unfortunately airlines often have more strict rules. Lufthansa says 20 max for example

https://www.lufthansa.com/us/en/prepare-for-your-trip/baggag...

Although 20 loose batteries is still plenty. The real challenge is the 15 devices per person limit

Do AirPods count as 3 devices because charging case + 2 ear pieces?

As a private person, international transport of devices with batteries is a pain.